from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import request
from flask import session

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from  flask  import  render_template

from info.utils.common import query_user_data, user_login_data
from info.utils.response_code import RET


@news_blu.route('/followed_user', methods=["POST"])
@user_login_data
def followed_user():
    """关注或者取消关注用户"""

    # 0. 取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="未登录")

    # 1. 取参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")

    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 2. 判断参数
    if action not in("follow", "unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not other:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # 4. 根据要执行的操作去修改对应的数据
    if action == "follow":
        if other not in user.followed:
            # 当前用户的关注列表添加一个值
            user.followed.append(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户已被关注")
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户未被关注")

    return jsonify(errno=RET.OK, errmsg="操作成功")





@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")


     # 1. 取到请求参数
    comment_id = request.json.get("comment_id")

    action= request.json.get("action")


    if not all([comment_id,action]):
        return  jsonify(errno=RET.PARAMERR,errmsg = "参数错误")

    if action not in ["add","remove"]:
        return  jsonify(errno =RET.PARAMERR,errmsg ="参数错误")

    try :
        comment_id = int(comment_id)

    except Exception as e :
        current_app.logger.error(e)
        return  jsonify(errno =RET.PARAMERR,errmsg ="参数错误")
    # 3.获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except  Exception as e :
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")


    if action =="add":

        # 点赞评论
        comment_like_model = CommentLike()
        comment_like_model.user_id  = user.id
        comment_like_model.comment_id = comment.id
        db.session.add(comment_like_model)
        comment.like_count += 1

    else:
        # 取消点赞评论
        comment_like_model= CommentLike.query.filter(CommentLike.user_id == user.id,CommentLike.comment_id == comment_id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1



    try:

        db.session.commit()
    except  Exception  as  e:
        db.session.rollback()
        current_app.logger.error(e)
        return  jsonify(errno = RET.DBERR, errmsg = "数据库操作失败")


    return  jsonify(errno = RET.OK,errmsg = "ok")



@news_blu.route('/news_comment', methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2. 判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 3. 初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 为什么要自己去commit()?，因为在return的时候需要用到 comment 的 id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg="OK", data=comment.to_dict())




@news_blu.route('/news_collect',methods = ["POST"])
@user_login_data
def collect_news():
    """
    收藏新闻
    1.获取参数
    2.校验参数
    3.查询新闻,并判断是否存在
    4.收藏
    :return:
    """

    user = g.user
    if  not  user:
        return  jsonify(errno = RET.SESSIONERR,errmsg="用户未登陆")



    # 1.获取参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2.校验参数
    if not  all ([news_id,action]):
        return  jsonify(errno = RET.PARAMERR,errmsg="参数错误")

    if  action   not  in ["collect", "cancel_collect"]:
        return  jsonify(errno = RET.PARAMERR,errmsg="参数错误")


    try:
        news_id = int(news_id)
    except  Exception as e :
        current_app.logger.error(e)
        return  jsonify(errno = RET.PARAMERR,errmsg="参数错误")




    # 3.  查询新闻,并判断新闻是否存在
    try:
        news = News.query.get(news_id)

    except Exception as e :
        current_app.logger.error(e)
        return  jsonify(errno = RET.DBERR,errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

     # 4. 收藏
    if action == "cancel_collect":
        # 取消收藏
        if news not in user.collection_news:

            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)
    else:
        # 收藏
        if news  not in user.collection_news:
            # 添加到用户的新闻列表
            user.collection_news.append(news)

    return  jsonify(errno =RET.OK, errmsg= "操作成功")









@news_blu.route('/<int:news_id>')
@user_login_data
def  news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """
    # 查询用户登陆信息
    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

        # 定义一个空的字典列表,里面装的是字典
    news_dict_li = []
    # 遍历对象列表.将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())




     # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e :
        current_app.logger.error(e)

    if  not news:
        # 报404错误,会显示到页面
        abort(404)

    # 更新 新闻的点击次数
    news.clicks += 1


    # 是否是收藏
    is_collected = False

    # if  用户已登陆
    # 判断用户是否收藏当前新闻,如果收藏
    if  user :
        # collected_news  后面可以不加all, 因为sqlalchemy会使用的时候去自动加载
        if news in user.collection_news:
            is_collected = True

    # 去查询评论数据
    comments = []
    try:
        comments=Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except  Exception  as e :
        current_app.logger.error(e)

    # 查询当前用户在当前新闻里面都点赞了哪些评论
    # 1. 查询出当前新闻的所有评论([COMMENT])   取到所有的评论id
    comment_ids = [comment.id for comment in comments]

    # 2.再查询当前评论中哪些评论被当前用户所点赞([CommentLike])  查询comment_id 在第一步的评论id列表内所有的数据
    comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),CommentLike.user_id == g.user.id).all()
    # 3.第二步查询出来的是一个 [CommentLike] 列表
    comment_like_ids = [comment_like.comment_id  for comment_like in comment_likes]   #[3,5]


    comment_dict_li = []
    for comment in  comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict['is_like'] = False
        # 判断当前遍历到的评论是是否被当前登陆用户所点过赞
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True




        comment_dict_li.append(comment_dict)


    is_followed = False
    # 判断用户是否收藏过该新闻
    is_collected = False
    if g.user:
        if news in g.user.collection_news:
            is_collected = True
        if news.user.followers.filter(User.id == g.user.id).count() > 0:
            is_followed = True

    data = {
        "user": user.to_dict() if user else  None,
        "news_dict_li": news_dict_li,
        "news":  news.to_dict(),
        "is_collected" : is_collected,
        "comments":comment_dict_li,
        "is_followed": is_followed
    }



    return  render_template('news/detail.html',data  = data)